There are three reasons for the elephant sign on the expressway:

1. Sign an elephant. This is because the abbreviation of Henan is "Yu", which means elephant. The Central Plains was called "Yuzhou" in ancient times, but "Yu" actually refers to elephants, because there were many elephants in Henan in ancient times.

2. In expressway, if there is an elephant identification certificate, remind the driver that there are animals.

3. If there is an elephant sign on the expressway, you should be careful of elephants coming in and out.